"Changes in morphological, anatomical, physiological, biochemical and behavioral characteristics of the animal which promote welfare and favor survival in a specific environment." — Hafez

Hafez defined an adaptation as above. The adaptation helps an animal survive in their external environment. The representative adaptive traits are:

1. Structural adaptation
2. Behavioral adaptation
3. Physiological adaptation

• Structural adaptation is the changes in physical features (e.g. body shape, skin, and internal organs) of the animal.
• Behavioral adaptation is the changes in behaviors (e.g. searching for food, mating, vocalizations, and mitigation) of the animal.
• Physiological adaptation is the changes in the animal body functions such as growth, temperature regulation, and ionic balance.
• Sometimes, adapted animal create a new species (speciation).

• 경청해 주셔서 감사합니다.